Rebound check



Nov. 17, 1925- 1,561,522

. R. T. NEWTON REBOUND cnscx Filed May 19 1923 2 sheets-sheet 2 "man:

INVENTOR ATTORNEYS Patented Nov. 17, 1925.

@UNITED NsTAiss 1,561,522 nmiam Norrrcr.

RICHARD T. NEWTON, oFNEw YORK, N. Y.

REBOUND CHECK.

Application led `May 19,1923. Serial 160.6410305.

Checks, of which the following is a specication.

My invention relates to rebound checks, and particularly to a device of the general type illustrated in my copending application Ser. No. 600,649', filed November 13, 1922, which serves te check the throw of the vehicle chassis by the springs through which it is supported on the running gear. My object is to simplify and improve my prior construction in certain teatures indicated *by `way of example in the accompanying drawings, in which- Fig. 1 is a more or less diagrammatic side elevation of a spring-supported chassis to which my invention is applied in one form;

Fig. 2 is a vertical section through the rebound check alone drawn to a larger scale;

Fig. 3 is a section on the line 3;-3, Fig. 2;

Fig. 4 is ya view similar to Fig. 2, but illus` trating a modified construction;

Fig. 5 isa section on the line 5 5, Fig. 4;

Fig. 6 is a broken side elevation of still `mother form of construction;

Fig. 7 is a plan view thereof.; y

Figs. `8, 9 and 10 are broken side /elefvae tions of several other modilied embodiments; y

Fig. 11 is a `plan view of the construction shown in Fig. p.; "and y y Fig. 12 is a broken side elevation of another variant.

In the jtypical installation shown in Fi-g. 1, the vehicle chassis 15 is supported ythrough the leaf springs 16 on the axle 17 of the running gear. Obviously upon severe stress of the springs 16 incident, for exampley to the sudden rise Aof the running gear over some obstruction 'in the roadway, the` springs 16 tend to throw the chassis v-iolently upward. To `prevent this sudden up# ward movement of the chassis is the object ofthe present invention.`

The device in the orfm indicated `in Figs.

1 to 3 compri-ses a flexible brake strap 18 Vattached at one end to an anchor clamp 19 adapted fte be engaged with the axle 17 by a cooperating `claw member w20 through which passes a screw pin 21 carried by the Aclamp 19 and provided with a clamping nut 22. The `other end of the strap passes over a friction drum 23 inthe form of an annular flange projecting from the face of the bracket 24 rigidly attached by 'screw bolts y25 to `the chassis iside bar 15, or other member rigid therewith. Arranged within the drum is a closely wound take-up coil spring 26, one end 27 of which is `offset `and secured Aby Clips 28 to the bracket 24. To the other end 29 `of the spring is riveted the end `of the brakey band 18, the latter passing through a gap 30 in the wall ofthe drum and encircling the spring within the drum.

An extension 31, which, for convenience of manufacture and assembly, may be made separate from the bracket 24 and secured thereto by rivets as indicated, projects Atrom the bracket and supports the pivoted brake -shoe 32. The latter is swung toward the brake drum 23 by the springs 33, but, under the drag of the brake band moves from the drum against the spring 33 during the takeup of the band `by the spring 26. On the contrary, when the band pays out, on the .upward fling of the lchassis by the vehicle spring 16, the friction'al grip of the brake `shoe B2 by the band (under the pressure of the` spring 33) causes the shoe to swing on its pivot :toward Vthe drum and thus to grip the band therebetween. `ln this construction the brake shoe 132 has a tubular shank 34 which houses a pressure spring `35 coiled on the stem `of the thrust pin 36 pivoted upon an Vadjustable bearing screw 37 in the end of the bracket extension 31. The adjustment of the bearing screw 37 varies the stress of the spring 33 and thus the effective 'thrust ofthe shoe 32 against the brake band during the checking operation. Peripheral notches 38 in the screw head receive :the detent nose oil the locking spring `39. Legends 40 exposed bythe `shoulders 41 at the end .of the locking spring, may be used `to indicate the spring tension.

Enclosing the brake drum, draw-up spring, :and associated end of the brake strap 18, is a housing cap 42, the side wall 'of which embraces the margin of the bracket `24 and is secured` thereto by screws 43. The side wall of the housing` is gapped at 441to' permit the `play `of the strap 18 therethrough `and to accommodate the brakeshoe and related parts.` r

The operation of the device is as follows. When the axle 17 rises toward the chassis 16, incident to some unevenness in the road bed, the leaf springs 16 are flexed and tend to throw the chassis violently upward. During the rise of the axle, slack in the brake band is taken up by the coil spring 26, the band slipping freely in this take-up direction past the brake shoe 32 and around the brake drum. Vhen the chassis in turn begins to4 rise in response to the throw of the stressed leaf springs 16, its motion is check ed by the band 18 which now grips the brake drum 23 under the pull of the coil spring 26, and is further restrained by the grip of the brake shoe 32, which now swings toward the drum (under the frictional pull of the brake band) and pinches the band against the drum. The brake shoe is yieldably supported, however, by its spring 35, so that only a predetermined regulable friction effort is imposed upon the band at this point. The rebound check uponthe chassis is thus the result of the combined frietional drags of the band upon the brake drum, and of the brake shoe upon the band. These efforts are substantially constant under given conditions, regardless of reasonable wear between the parts, owing to the spring character of the thrusts exerted.

The same results are obtained in the construction shown in Figs. 4 and 5, in which certain modifications of detail are indicated. Thus, the brake drum 45 instead of being cylindrical is conchoidal or spiral, and the gap 46 through which the brake band 18 enters the drum is afforded by the radially spaced ends of the spiral. The take-up spring 47 is of the spiral band type with its inner end Vsecur'ed to the central fixed post 48, and its outer end riveted to the brake band. The extension 49 which may be cast integral with the bracket 50, or may be independent thereof, as indicated in dotted lines, houses the brake shoe spring plunger 51. In the present case, this plunger is independent of the brake shoe 52 which is supported thereon through a rocking joint on the plunger arms 53 which engage notches 54 in side bearing flanges 55 on the shoe. The thrust pin 56 is pivoted at 57 at the outer end of the frame extension 49,

' the support in this instance lacking the fea ture of adjustability illustrated in the form first described. Instead of a push spring gripping effort of the shoe upon the band during this movement. The shoe is halted by the abutment 59 on the extension arm 49, at the point at which it is under the greatest stress of its spring 35.

In the modification shown in Fig. 6, I have dispensed with the.friction shoe and employ merely a brake drum 60 and brake band 61, which may be faced at 62 with'fric tion material. One end of the strap 61 has secured thereto an anchor 63 provided with a bearing eye 64 adapted to receive a pin 65 passing through bosses in the legs 66 of a forked lever 67. The other end of the strap is provided with an eye 68 adapted to receive a pin 69 passed through the ends of the legs 66 of the lever 67 To the opposite end of the lever 67 is jointed a rigid link 70 leading to the axle. In extension of the bearing eye 64 of the anchor 63 is an abutment lug 71 against which thrusts a spring 72 interposed between said abutment and the lug 73 on the lever arm 67 Extending through the lug 73 is a spring guide pin 74 with holding nut 75. Also fast with the lever is a lug 76 with adjustable set screw 77 adapted to engage the abutment 71. In loose band position the lever 67, under the effort of the spring 72, takes the position indicated in Fig. 6, that is to say, with the anchorages 63 and 68 so located with respect toeach other that the band 61 is sprung free from the drum 60. This position is incident to an upward movement of the link 70'connected to the axle. When the link 70 moves downward, the lever 67 swings on pivot 65 and drawing the eye 68 upward with respect to the eye 64, on the other end of the band, the latter is closed upon the drum and thus checks the throw of the chassis by the vehicle springs. j

In Fig. 8 I have shown another modification of the general type indicated in Figs. 1 to 5. In this construction the band 18, passing around the cylindrical drum 78 and through the gap 79 therein, is secured to a cam member 80 actuated by an internal spiral spring 81. The varying diameter of the cam will compensate the varying pull of the return spring as its torsional effort increases or decreases. An even pull is thus exerted upon the strap at all times. The brake shoe 82 instead of rocking, has a stem 83 which passes rectilinearly through a guide sleeve 84. The end of the stem bears against one end of a lever 85 to the other end of which is connected a friction finger 86. The latter engages the brake band 18 and on the pay-out movement of the latter is shifted in a direction to depress the end of the lever 85 to which'it is attached and thus lift the opposite end against thek stem 83 of the brake shoe 82. The latter is thus pressed against the brake band.

In Fig. 9 the drum 87 is uninterrupted Lactancia .and the brake band 18 is passed around the same and secured at one end to the end 88 of the coil spring 89, the drum 87 being slotted at 90 to permit the play of the .sprin therethrough. The brake shoe `91 may be o. the `type illustrated in Fig. 1. @bviously the `compression of the inner portion of the 1brake iband upon the drum 87 Lby the outer portion of the band which overlaps when -thesprings 16 are under heavy pressure, aids in the braking `etolt of the band against the drum.

y In Figs. 10 and 11 a modification of the construction sh-own in Figs. f6 and 7 is illus-` trated. In this form the braking lever 92 is pivoted on a stud 93 carried by an arm 94 journalled with friction in the drum bracket 95. One end 96 of the brake band is secured to the stud 97 on the lever 92 at one side of its rocking axis 93, while the other end 98 of the brake band is secured t'o the stud 99 on the opposite side of the axis 93 of the lever 92. The link 100 extending toward the axle is joined by a short flexible strap 101 to the outer end of the lever 92 instead of by pivot joint, as in Figs. 6 and 7. Obviously when the link 100 pulls down, the lever 92 is rocked on its axis and tends to tighten the brake band on the drum 102. As the link 100 moves further downward the band 96, now tight on the drum, slips around the latter, the bracket arm 94 as a, whole moving downward with the link 100.

In order to assist in holding the brake band loose, the bracket arm 94 has a forked end, one leg 103 of which underlies the lever 92 and supports the spring104, the effort of which is constantly to force the lever 92 into brake releasing position. The other arm 105 of the form overlies the lever 92 and carries a stop pin 106, which limits the upward movement of the lever 92. Consequently when the link 100 rises, the brake band is irst released and the bracket arm 94 then swung up to normal position.

In Fig. 12 I have indicated a brake band annulus 107 surrounding the brake drum 108 and engaging a lever arm 109 to which the link 110 leading to the axle is pivotally connected. In this construction the braking action of the band is equal whether the arm 109 rocks up or down. However, the brake effect in one direction (viz down) is increased by the pivoted brake shoe 111 which cooperates with the. band in a manner analogous to that shown in Fig. 1.

Various other modications will readily occur to those skilled in the art, which embody the underlying thoughts which I claim as my invention.

I claim- 1. A rebound check device comprising a drum adapted to be mounted in fixed position upon the body portion of the vehicle, a brake band around said drum, and means adapted for Yoperation by the running gear for causing trrctional movement `oi said band around said drum on relative movement of the body and running gear, together' with a brake `shoe cooperating with said drum and band to grip `the latter under predetermined conditions.

:2. A rebound check device `comprising a drum adapted to "be mounted in fixed position upon tlhe body portion of the vehicle, Ia brake band around said drum, and means .adapted for operation by the running gear for causing frictional `movement of `said band 'around said drum on relative move- .ment of the body and running gear, together with a brake shoe cooperating with said drum and band and moved by the drag of the latter into active gripping relation.

3. A rebound check device comprising a drum adapted to be mounted in fixed position upon the body portion of the vehicle, a brake band around said drum, and means adapted for operation by the running gear for causing frictional movement of said: band around said drum on relative movement of the body and running gear, together with a brake shoe cooperating with said drum and band and moved by the drag of the latter only in one direction into active gripping relation.

4. A rebound check device comprising a drum adapted to be mounted in fixed position upon the body portion of the vehicle, a brake band around said drum, and means adapted for operation by the running gear for causing frictional movement of said band around said drum on relative movement of the body and running gear together with a brake shoe pressing the band against the drum, and spring means limiting the pressure exerted by the brake shoe.

5. A rebound check device comprising a drum adapted to be mounted in fixed position upon the body portion of the vehicle, a brake band around said drum, and means adapted for operation by the runnin gear for causing frictional movement o said band around said drum on relative movement of the body and running gear, together with a pivoted brake shoe cooperating with said drum and band to grip the latter under predetermined conditions.

6. A rebound check device comprising a drum adapted to be mounted in fixed position upon the body portion of the vehicle, a brake band around said drum, and means adapted for operation by the running gear for causing frictional movement of said band around said drum on relative movement of the body and running gear, together with a pivoted brake shoe cooperating with said drum and band to grip the latter under predetermined conditions, and spring means biasing said brake shoe against the band to insure the drag of the latter thereon.

7. A rebound check device Comprising a drum adapted t0 be mounted in Xed position upon the body portion of the vehicle, a brake band around said drum, and means adapted for operation by the running gear for causing friotional movement of said band around said drum on relative movement of the body and running gear together with a brake shoe pressing the band against the drum, and spring means limiting the pressure exerted by the brake shoe, in oombination With means for regulating the pressure of said springs.

8. A rebound cheek device comprising a drum adapted to be mounted in fixed posibination With means for regulating the presz.

sure of said springs, and means for indicating said pressure.

In testimony whereof I have signed my name to this specification.

RICHARD T. NEWTON. 

